Get the submission status. Returns one of the defined constants (STATUS_INCOMPLETE, STATUS_ARCHIVED, STATUS_PUBLISHED, STATUS_DECLINED, STATUS_QUEUED_UNASSIGNED, STATUS_QUEUED_REVIEW, or STATUS_QUEUED_EDITING). Note that this function never returns a value of STATUS_QUEUED – the three STATUS_QUEUED_... constants indicate a queued submission. NOTE that this code is similar to getSubmissionStatus in the AuthorSubmission class and changes should be made there as well.